Rear Spoiler concensus

Re: Rear Spoiler concensus (B24)

Fri, 19 Apr 2013 22:55:04 GMT

There may be restrictions on size and location for a wing. Better check the regulations before spending time and money on something they may not fit within the rules.
They may also be constraints on single or twin plane wings so check this too.
My car ran the smaller wing which was good. I then fitted a larger, different designed wing which proved to be more stable and responded well to changes in 'angle of attack'.

Re: Rear Spoiler concensus (MrPink2013)

Fri, 19 Apr 2013 15:16:16 GMT

Stuka,

Apparently, 90kms/ph is the threshold of wind tolerance. Tarmac rally speeds are open so 90k is slow.

Re: Rear Spoiler concensus (stuka)

Fri, 19 Apr 2013 12:31:51 GMT

what kind of speed would you need before a spoiler becomes effective? I only ask as this is a rally car not a circuit car

Re: Rear Spoiler concensus (worldwalker)

Fri, 19 Apr 2013 02:57:22 GMT

If anything it would destroy the little laminar airflow left and create more turbulence and drag than down force. The best thing you could do to the roof is get the airflow to pull back down, a hatch over the engine compartment is the best solution for this, it also means you can sit a rear wing much lower down and would also reduce over all drag significantly.

There are other alternatives to keeping the air flowing through this area but a hatch is relatively easy to make, provides better cooling for the engine bay, gives you a fantastic slim location for the intercooler and would increase top speed. The biggest problems would be managing the engine bay airflow, obviously some redesigning here would also be in order to keep the two areas of high pressure from mixing. I'd probably look at vortex generators on the roofline a duct for the cooler then tapering the airflow from the cooler so that it encourages airflow back out the top behind the intercooler. I'd imagine a rear defuser wouldn't go astray either, the airflow from the engine bay and exhaust must be horrible.

Re: Rear Spoiler concensus (Knightrous)

Thu, 18 Apr 2013 22:42:33 GMT

On topic but off topic, why hasn't anyone tried a trailing roof mounted wing?
I would assume this position would have better air flow, a better placement of down force across the centre of the car (verses pushing down behind the rear axle and unloading the front.) and it would be able to use the roof and c pillars as structure for applying the down force.

Re: Rear Spoiler concensus (kameleon)

Thu, 18 Apr 2013 21:44:24 GMT

In line or slightly above the roofline is the go. Mounting to the chassis works alit better than just thebboit too. If you can only mount to the boot replace the rubber stoppers with something that holds it solid (the japanese generally use latches) there is alot more you could do, but this works.

Rear Spoiler concensus (MrPink2013)

Thu, 18 Apr 2013 15:28:22 GMT

I am in the final stage of the construction of a tarmac rally car and was wondering if there is any consensus on rear spolier configuration?